Roof board



FIG. 1 is a front elevational view of a roof board according to our design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a cross-sectional view thereof, along line 7.-7. of FIG. 1;

FIG. 8 is a cross-sectional view thereof, along line 8.-8. of FIG. 1;

FIG. 9 is an enlarged detail view of the circumscribed area in FIG. 1;

FIG. 10 is an enlarged detail view of the circumscribed area in FIG. 7; and,

FIG. 11 is an enlarged detail view of the circumscribed area in FIG. 8.

The broken lines in the figures depict portions of the roof board that form no part of the claimed design. 

CLAIM The ornamental design for a roof board, as shown and described. 